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The following is megabass circuit schematic (Mega Bass Circuit) . The megabass circuit is a modified Baxandall tone control with no bass cut and no treble control. It boosts frequencies from about 30Hz to 160Hz can boost by 14dB.

Megabass Schematics

Note:

The input capacitor can be replaced with a .01uf cap if you wish.

The 10pf capacitor is optional and will start rolling off everything over 15kHz. 5pf will double this to 31kHz.

The tone control requires a low impedence input. If you already have a low impedence input, the input buffer can be removed. However, the output is inverted.The opamp is not critical. A 4558 would be just fine.I do not show the parts for the +4.5 reference. Here is the +4.5 voltage divider I used.IC A4558 Pinning

The A4558 is a monolithic Integrated Circuit designed for dual operational amplifier.